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Attention: RHN Hosted will reach the end of its service life on July 31, 2017.
Customers will be required to migrate existing systems to Red Hat Subscription Management prior to this date.
Learn more here

libgcj4 previously used its hardcoded simple timezone information. This
information was not kept up to date with the system timezone data
updates and did not handle historical daylight saving information.
Instead, it used the latest applicable daylight saving time changing
rule for each timezone as of the time the gcc release branch had been
created.

These updated packages read the timezone information data from system
tzdata package files and are able to handle daylight saving time
transitions even for past years.

For full details regarding all fixed bugs, refer to the package changelog
as well as the specified list of bug reports from bugzilla.

All users of gcc4 should upgrade to these updated packages, which resolve
this issue.

Solution

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied. Use Red Hat
Network to download and update your packages. To launch the Red Hat
Update Agent, use the following command:

up2date

For information on how to install packages manually, refer to the
following Web page for the System Administration or Customization
guide specific to your system: